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package pkg23designpatterns.za.ac.cput.behavioural.observer;

import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

/**
 *
 * @author Oceanwave
 */
public class WeatherStation implements WeatherSubject
{

    Set<WeatherObserver> weatherObservers;
    int temperature;

    public WeatherStation(int temperature) 
    {
        weatherObservers = new HashSet<WeatherObserver>();
        this.temperature = temperature;
    }
            
    @Override
    public void addObserver(WeatherObserver weatherObserver) 
    {
        weatherObservers.add(weatherObserver);
    }

    @Override
    public void removeObserver(WeatherObserver weatherObserver) {
        weatherObservers.remove(weatherObserver);
    }

    @Override
    public void doNotify() 
    {
        Iterator <WeatherObserver> it = weatherObservers.iterator();
        while(it.hasNext())
        {
            WeatherObserver weatherObserver = it.next();
            weatherObserver.doUpdate(temperature);
        }
        
    }
    
    public void setTemperature(int newTemperature)
    {
        System.out.println("\nWeather Station setting temperature to " + newTemperature);
        temperature = newTemperature;
        doNotify();
    }
    
}
